There are many tips and tutorials online that teach survivalism skills, but for my money the one-sheeters are the best because you can actually print them out and take them with you.
Take this handy dandy illustrated chart for example- it's about a sheet and a half in length yet shows a whopping 66 different shelters you can make using a simple tarp.
This sheet could be a life saver if you're ever out roughing it for reals and the rain starts to fall, but these tarp shelter formations could also come in handy at the park or in the backyard.
-Via Goods Home Design